*{
    margin: 0;
    padding: 0;
}
.container{
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}
/* header */
.header{
    width: 90%;
    margin: 50px auto;
}
/* main */
.main{
    width: 90%;
    display: flex;
    border-top: 1px solid #eee;
    border-bottom: 1px solid #eee;
    box-shadow: 2px 1px #eee;
    margin: 0 auto;
}
.left-menu{
    flex: 2;
}
.left-menu>ul>li{
    width: 100%;
    height: 45px;
    list-style: none;
    line-height: 45px;
    text-align: center;
    border: 1px solid #f4f4f4;
    text-decoration: none;
}
.left-menu>ul:first-child{
    border-bottom: none;
}
.left-menu>ul>li:hover{
    background-color: #f4f4f4;
}

/* right-content */
.right-content{
    flex: 8;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 35px;
}